Thermostatic circuit-closer.



A. l. BENNETTr THERMOSTAHC CIRCUIT CLOSER.

APPLICATION FILED APR. 14, 1917.

1,263, 1 90 Patented Apr; 16, 1918;

2 SHEETS-SHEET 1- I] r o DI I'JJ Z14 4Z3 INVENTOR WITNESSES ATTORN EY A.l. BENNETT.

I THERMOSTATIC ClRCUlT CLOSER. APPLICATION man APR. 14. 1917. 1,263,190.Patented Apr. 16, 1918.

m x is N N m 2 SHEETSSHEET 2 N N Y k 1? R v INVENTOR WITNESSES vAJIBennett ATTORNEY ALBERT I. BENNETT, OF FORT ATKINSON, WISCONSIN.

THERMOSTATIC CIRCUIT-CLOSER.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application filed April 14, 1917. Serial No. 162,094=.

To all whom it may concern:

Be it known that I, ALBERT I. BENNETT, a citizen of the United States,residing at Fort Atkinson, in the county of Jefierson and State ofWisconsin, have invented new and useful Improvements in ThermostaticCircuit-Closers, of which the following is a specification.

My invention relates to electric automatic fire alarms and has for itsobjects; first, to provide an efficient electric alarm which iscontrolled by a sensitive thermostatic switch, which when the thermostatreaches a predetermined degree of heat closes a circuit and therebyactuates the alarm, second, to provide an efiicient automatic electricfire alarm system having a number of alarms and a number of switcheswhereby when any one of the switches is closed all of the alarms in thesystem are operated; and thirdly, to provide an electric alarm systemhaving a number of switches and a number of alarms and an annunciatorwhereby, when one of the switches in the system is closed, all thealarms in the system are actuated and the annunciator is actuated toshow which switch is closed.

I attain these objects by the mechanism illustrated in the accompanyingdrawings forming a part of this specification, in which Figure 1 is atop plan view of an alarm device embodying my invention,

Fig. 2 is a side elevation of the same in partial section,

Fig. 3 is a diagram of the wiring system of my invention.

Like characters of reference indicate like parts in the various views.

In the drawings 1 indicates the base of the alarm. Said base is metallicand is a conductor of electricity. Mounted on said base is a signal 2 ofthe electromagnetic type comprising electromagnetic elements 3, avibrating arm 4 of metal and positioned to be actuated by saidelectromagnetic elements 3, a circuit breaker 5 in operable connectionwith said vibrating arm and adapted to hold the circuit closed when saidarm is in its distant position relative to said electromagneticelements, and to open the circuit when said arm is in its closedposition respecting said electromagnetic elements 3, and a spring pivot6 for holding said vibrating arm away from said electromagneticelements, said circuit breaker being in circuit with saidelectromagnetic elements 3 whereby when said signal is energized thevibrating arm is moved to and fro. An extension arm 7 of said vibratingarm 4 has a knocker 8 at its upper end and is positioned relative to agong 9 fixedly mounted on said base 1 and insulated therefrom so that itstrikes the gong as said arm 4 moves to and fro as hereinbeforedescribed. The electromagnetic elements 3 are mounted upon a frame 10.The spring pivot 6 is also mounted on said frame, said vibrating arm 4,spring pivot 6, frame 10, and base 1 being in metallic contact. Astationary contact 11 of the circuit breaker 5 is mounted upon anextension of frame 10 and is insulated therefrom, said contact being inoperable relation with extension 12 of vibrating arm 4. An insulatedelectric conductor 13 leads from stationary contact 11 to one end of thecontactor in the electromagnetic elements 3. Thus one conductor of thecircuit to the electromagnetic elements 3 is composed of conductor 13,contact 11, extension 12, vibrating arm 4, frame 10, and base 1. A.binding post 14 is mounted upon base 1 in metallic connection therewithfor convenient connection with an electric circuit. An insulatedconductor 15 is in electrical connection with the other end of theconductor of electromagnetic elements 3 and leads down underneath thebase 1 through a convenient hole therein. A dust cover 16 is mounted onbase 1 in a usual manner and has an opening therein to allow arm 7 tooperate therethrcugh. The above described electric signal is of usualconstruction and needs no further description for the present purposes,except to say that when it is in circuit with an electric energizer thearm 4 vibrates to and fro thereby causing knocker 8 to strike gong 9.

A thermostat 17 of usual construction having a contact 18 on its uppersurface and a stud 19 projecting from its lower surface is mounted uponbase 1 by means of stud l9 and a nut 20 screw threaded thereon.Insulating washers 21 prevent said stud and nut from contacting withsaid base. An electric conductor 22 has one end confined between thelower washer 21 and nut 20 and is in electric connection with said nut,and said conductor 22 is connected with a binding post 23 mounted uponbase 1 and inis formed thereon and positioned in the path of contact18-of said thermostat. Said contact bar and thermostat witht-heirappurtenant parts form a thermally operated switch which closes .whenthe thermostat reaches ,a predetermined degree of heat. A stud 29 ismounted on said base 1 and insulated therefrom by insulating washers 30,nuts 31 screw threaded upon said stud confining said base between saidwashers. Said stud extends upwardly through a hole 32 of contact 'bar 27located near the free end thereof.

"-A supporting nut 33 is screw threaded upon stud 29 and engages thebottom side of said contact bar. thus supporting one end of the same. Aspiral compression spring 35 encircles said stud and bears down upon bar27 and a pair of washers 34 engages with {the ends of the spring. A nut36 screw threaded upon said stud engages the other end of said springand compresses the same. A pointer 37 ofcontact bar 27 extends from thefree end of the same. A standard 38 is mounted upon said base 1 by meansof nuts 39 screw threaded thereon engaging insulating washers 40 andconfining said base between them. Said standard 38 has a scale 41inscribed thereon in proximity to the pointer 37 whereby it is possibleto adf just said contact bar 27 by means of supporting nut 33 so thatthe contact l8 of 'thermostat 17 will contact the contact point "28 atacertain temperature. By reason of the spring engagement to hold downsaid contacting bar 27 the thermostat cannot be injured if thetemperature were to rise to such a point that contact 18 would movebeyond contact point 28. In such an event said contact pushes thecontact bar against the spring 35 and raises thesame, no injury beingdone upon the thermostat thereby.

The conductor 15 is confined between the lower nut 31 and washer 30 andis in metallic contact with stud 29. An electric conductor 42 has one ofits ends confined between lower nut 31 and washer 30 and is inelectrical contact with said stud 29. A binding post 43 is mounted uponbase 1 and is insulated therefrom. The other end of conductor 42 is inelectrical contact with said binding post for convenient connection withan electrical circuit for purposes hereinafter described.

An electric battery 44 is provided and is .of usual constructionhaving afeed wire 45 leading from one pole thereof and a return wire 46 leadingfrom the other pole thereof. SeeFig. 3.

It will benoted that the terms feed wire and return wire are used merelyto the different wires and do not designate the direction of the flow ofthe currenttherethrough. Said feed wire leads from said battery to anannunciator of usual construction and having anannunciating'device foreach signal inthe system. Each annunciating device consists of anelectromagnetic element 48 in operable relation with a pivot arm 49, andhaving a spring 50 holding said pivot arm normally in a distant positionfrom said electromagnetic element and against a ings 52 are placed inthe side of the annunciator casing, there being one for eachannunciating device. These sight openings are positioned respectingouter ends of said pivoted arms so that said ends are in registry withtheir corresponding sight openings when the pivoted arms are in closerelation with said magnetic elements whereby it can be determined whichalarm circuit is closed. Branches 54 of said feed wire lead to .one endof the electric conductor of each magnetic element 48 of theannunciator. The wires 53 lead from the other ends of .each of saidelectric conductors of said magnetic elements and are connected to thebinding post 23 and are thus in electrical connection with thethermostats 17 as hereinbefore described. Return wires 46' lead fromsaid battery to the binding post 14 of each signal. A wire 55 isconnected to the binding post 43 of each signal. 8 l

When the system is installedinabuilding signals are placed atintervals-throughout the building. The annunciator is placed at aconvenient position therein. 9'

In the operation of the device the circuits are normally opened and nocurrent flows therethrough. However, if the temperature around one ofthe signals rises so that the thermostat moves contact 18 into contactwith contact point 28 the circuit for that signal is closed and currentflows therethrough actuating'the alarm and the annunciator ashereinbefore described. The closing of said circuit alarm closes acircuit by which each of the other alarms in the system is actuated.This second circuit flows through feed wire 45 through the samecontactor as the first mentioned circuit to the stud-29 where itbranches and by means of conductors 42 and binding posts 43 and the wire55 flows to each of'the signalsin the system actuating the same andreturning over the respective return wires 46. The alarm is given overthe whole building and by means of the annunciator it can be determinedfrom a contact point just what switch is closed.

Having thus fully described my invention, I claim:

1. A device of the class described comprising a base, a thermostatthereon, a pair of studs on said base, a contact bar havmg one endpivoted to one stud and its other end engaging the second stud, a nut onsaid second stud for adjusting the position of the bar in relation tothe thermostat, a coil spring on said second stud engaging with the bar,and a nut on the stud for ad usting the tension of the spring, saidthermostat and contact bar being included in an electrical circuit.

2. A device of the class described comprising a base, a thermostatlocated thereon, a pair of studs, a contact bar having one end pivotedto one stud and its other end provided with a hole which engages thesecond stud, said bar having a downwardly projecting contact pointarranged in the path of said thermostat, a nut on the said second studlocated below the bar for adjusting the copies of this patent my beobtained for position of the same in respect to the thermostat, a coilspring on the second stud engaging with the upper face of the bar, and anut on the stud for adjusting the tension of said spring, saidthermostat and contact bar being included in an electrical circuit.

3. A device of the class described comprising a casin a thermostatmounted thereon, a pair 0 studs on said base, a contact bar pivoted toone of said studs and having a contact point arranged in the path ofsaid thermostat, the other end of said bar being bent downwardly, andhaving its end extending horizontally and provided with an opening toengage the second stud, a nut on said second stud for adjusting theposition of the bar in relation to the thermostat, a coil spring on saidstud engaging with the upper face of the bar and a standard adjacent theextreme end of the bar and pro vided with indicating marks, saidthermostat and contact bar being included in an electrical circuit.

In testimony whereof I afiix my signature.

ALBERT I. BENNETT.

five cents each, by addressing the commissioner of 2mm. Washington, D.G.

